Thinking about it a little more. The plugin may not have the image. Instead there may be a line of code in the plugin, probably in the install.php, that is calling for the image. They probably did this to have an icon that would match the other icons for size, and color. If that is the case, it's a little extra pain. You could create your svg set to match the existing theme console item colors, and upload it to your server, unzip it, and place it in the themes images folder, then change the code to point to that image. You would have to re-add the image with each theme update since the updates do a complete overwrite, and anytime you make a change in cpanel, you need to enable dev mode in the config.php by setting it to true, go to your website, and refresh any page, then set dev mode back to false.
The plugin is adding the icon. Since I don't have it I couldn't tell you how it is adding it. You could contact the plugin developer to get info on replacing that icon with another.